Just thought I'd say that this seems to have been resolved. Thanks!
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do-release-upgrade fails to upgrade
https://bugs.launchpad.net/bugs/323274
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# apt-cache policy update-manager-core
update-manager-core:
Installed: 0.56~dapper5
Candidate: 0.56~dapper5
Version table:
*** 0.56~dapper5 0
500 http://fi.archive.ubuntu.com dapper-updates/main Packages
100 /var/lib/dpkg/status
That's from my systems.
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Public bug reported:
Upgrading from dapper to hardy was still working yesterday, but today it fails
with:
# do-release-upgrade
Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
extracting 'hardy.tar.gz'
Failed to extract
Extracting the upgrade